1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * AMCC SoC PPC4xx Crypto Driver
4 *
5 * Copyright (c) 2008 Applied Micro Circuits Corporation.
6 * All rights reserved. James Hsiao <jhsiao@amcc.com>
7 *
8 * This file implements AMCC crypto offload Linux device driver for use with
9 * Linux CryptoAPI.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/interrupt.h>
14 #include <linux/spinlock_types.h>
15 #include <linux/random.h>
16 #include <linux/scatterlist.h>
17 #include <linux/crypto.h>
18 #include <linux/dma-mapping.h>
19 #include <linux/platform_device.h>
20 #include <linux/init.h>
21 #include <linux/module.h>
22 #include <linux/of_address.h>
23 #include <linux/of_irq.h>
24 #include <linux/of_platform.h>
25 #include <linux/slab.h>
26 #include <asm/dcr.h>
27 #include <asm/dcr-regs.h>
28 #include <asm/cacheflush.h>
29 #include <crypto/aead.h>
30 #include <crypto/aes.h>
31 #include <crypto/ctr.h>
32 #include <crypto/gcm.h>
33 #include <crypto/sha1.h>
34 #include <crypto/rng.h>
35 #include <crypto/scatterwalk.h>
36 #include <crypto/skcipher.h>
37 #include <crypto/internal/aead.h>
38 #include <crypto/internal/rng.h>
39 #include <crypto/internal/skcipher.h>
40 #include "crypto4xx_reg_def.h"
41 #include "crypto4xx_core.h"
42 #include "crypto4xx_sa.h"
43 #include "crypto4xx_trng.h"
44
45 #define PPC4XX_SEC_VERSION_STR "0.5"
46
47 /*
48 * PPC4xx Crypto Engine Initialization Routine
49 */
crypto4xx_hw_init(struct crypto4xx_device * dev)50 static void crypto4xx_hw_init(struct crypto4xx_device *dev)
51 {
52 union ce_ring_size ring_size;
53 union ce_ring_control ring_ctrl;
54 union ce_part_ring_size part_ring_size;
55 union ce_io_threshold io_threshold;
56 u32 rand_num;
57 union ce_pe_dma_cfg pe_dma_cfg;
58 u32 device_ctrl;
59
60 writel(PPC4XX_BYTE_ORDER, dev->ce_base + CRYPTO4XX_BYTE_ORDER_CFG);
61 /* setup pe dma, include reset sg, pdr and pe, then release reset */
62 pe_dma_cfg.w = 0;
63 pe_dma_cfg.bf.bo_sgpd_en = 1;
64 pe_dma_cfg.bf.bo_data_en = 0;
65 pe_dma_cfg.bf.bo_sa_en = 1;
66 pe_dma_cfg.bf.bo_pd_en = 1;
67 pe_dma_cfg.bf.dynamic_sa_en = 1;
68 pe_dma_cfg.bf.reset_sg = 1;
69 pe_dma_cfg.bf.reset_pdr = 1;
70 pe_dma_cfg.bf.reset_pe = 1;
71 writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG);
72 /* un reset pe,sg and pdr */
73 pe_dma_cfg.bf.pe_mode = 0;
74 pe_dma_cfg.bf.reset_sg = 0;
75 pe_dma_cfg.bf.reset_pdr = 0;
76 pe_dma_cfg.bf.reset_pe = 0;
77 pe_dma_cfg.bf.bo_td_en = 0;
78 writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG);
79 writel(dev->pdr_pa, dev->ce_base + CRYPTO4XX_PDR_BASE);
80 writel(dev->pdr_pa, dev->ce_base + CRYPTO4XX_RDR_BASE);
81 writel(PPC4XX_PRNG_CTRL_AUTO_EN, dev->ce_base + CRYPTO4XX_PRNG_CTRL);
82 get_random_bytes(&rand_num, sizeof(rand_num));
83 writel(rand_num, dev->ce_base + CRYPTO4XX_PRNG_SEED_L);
84 get_random_bytes(&rand_num, sizeof(rand_num));
85 writel(rand_num, dev->ce_base + CRYPTO4XX_PRNG_SEED_H);
86 ring_size.w = 0;
87 ring_size.bf.ring_offset = PPC4XX_PD_SIZE;
88 ring_size.bf.ring_size = PPC4XX_NUM_PD;
89 writel(ring_size.w, dev->ce_base + CRYPTO4XX_RING_SIZE);
90 ring_ctrl.w = 0;
91 writel(ring_ctrl.w, dev->ce_base + CRYPTO4XX_RING_CTRL);
92 device_ctrl = readl(dev->ce_base + CRYPTO4XX_DEVICE_CTRL);
93 device_ctrl |= PPC4XX_DC_3DES_EN;
94 writel(device_ctrl, dev->ce_base + CRYPTO4XX_DEVICE_CTRL);
95 writel(dev->gdr_pa, dev->ce_base + CRYPTO4XX_GATH_RING_BASE);
96 writel(dev->sdr_pa, dev->ce_base + CRYPTO4XX_SCAT_RING_BASE);
97 part_ring_size.w = 0;
98 part_ring_size.bf.sdr_size = PPC4XX_SDR_SIZE;
99 part_ring_size.bf.gdr_size = PPC4XX_GDR_SIZE;
100 writel(part_ring_size.w, dev->ce_base + CRYPTO4XX_PART_RING_SIZE);
101 writel(PPC4XX_SD_BUFFER_SIZE, dev->ce_base + CRYPTO4XX_PART_RING_CFG);
102 io_threshold.w = 0;
103 io_threshold.bf.output_threshold = PPC4XX_OUTPUT_THRESHOLD;
104 io_threshold.bf.input_threshold = PPC4XX_INPUT_THRESHOLD;
105 writel(io_threshold.w, dev->ce_base + CRYPTO4XX_IO_THRESHOLD);
106 writel(0, dev->ce_base + CRYPTO4XX_PDR_BASE_UADDR);
107 writel(0, dev->ce_base + CRYPTO4XX_RDR_BASE_UADDR);
108 writel(0, dev->ce_base + CRYPTO4XX_PKT_SRC_UADDR);
109 writel(0, dev->ce_base + CRYPTO4XX_PKT_DEST_UADDR);
110 writel(0, dev->ce_base + CRYPTO4XX_SA_UADDR);
111 writel(0, dev->ce_base + CRYPTO4XX_GATH_RING_BASE_UADDR);
112 writel(0, dev->ce_base + CRYPTO4XX_SCAT_RING_BASE_UADDR);
113 /* un reset pe,sg and pdr */
114 pe_dma_cfg.bf.pe_mode = 1;
115 pe_dma_cfg.bf.reset_sg = 0;
116 pe_dma_cfg.bf.reset_pdr = 0;
117 pe_dma_cfg.bf.reset_pe = 0;
118 pe_dma_cfg.bf.bo_td_en = 0;
119 writel(pe_dma_cfg.w, dev->ce_base + CRYPTO4XX_PE_DMA_CFG);
120 /*clear all pending interrupt*/
121 writel(PPC4XX_INTERRUPT_CLR, dev->ce_base + CRYPTO4XX_INT_CLR);
122 writel(PPC4XX_INT_DESCR_CNT, dev->ce_base + CRYPTO4XX_INT_DESCR_CNT);
123 writel(PPC4XX_INT_DESCR_CNT, dev->ce_base + CRYPTO4XX_INT_DESCR_CNT);
124 writel(PPC4XX_INT_CFG, dev->ce_base + CRYPTO4XX_INT_CFG);
125 if (dev->is_revb) {
126 writel(PPC4XX_INT_TIMEOUT_CNT_REVB << 10,
127 dev->ce_base + CRYPTO4XX_INT_TIMEOUT_CNT);
128 writel(PPC4XX_PD_DONE_INT | PPC4XX_TMO_ERR_INT,
129 dev->ce_base + CRYPTO4XX_INT_EN);
130 } else {
131 writel(PPC4XX_PD_DONE_INT, dev->ce_base + CRYPTO4XX_INT_EN);
132 }
133 }
134
crypto4xx_alloc_sa(struct crypto4xx_ctx * ctx,u32 size)135 int crypto4xx_alloc_sa(struct crypto4xx_ctx *ctx, u32 size)
136 {
137 ctx->sa_in = kcalloc(size, 4, GFP_ATOMIC);
138 if (ctx->sa_in == NULL)
139 return -ENOMEM;
140
141 ctx->sa_out = kcalloc(size, 4, GFP_ATOMIC);
142 if (ctx->sa_out == NULL) {
143 kfree(ctx->sa_in);
144 ctx->sa_in = NULL;
145 return -ENOMEM;
146 }
147
148 ctx->sa_len = size;
149
150 return 0;
151 }
152
crypto4xx_free_sa(struct crypto4xx_ctx * ctx)153 void crypto4xx_free_sa(struct crypto4xx_ctx *ctx)
154 {
155 kfree(ctx->sa_in);
156 ctx->sa_in = NULL;
157 kfree(ctx->sa_out);
158 ctx->sa_out = NULL;
159 ctx->sa_len = 0;
160 }
161
162 /*
163 * alloc memory for the gather ring
164 * no need to alloc buf for the ring
165 * gdr_tail, gdr_head and gdr_count are initialized by this function
166 */
crypto4xx_build_pdr(struct crypto4xx_device * dev)167 static u32 crypto4xx_build_pdr(struct crypto4xx_device *dev)
168 {
169 int i;
170 dev->pdr = dma_alloc_coherent(dev->core_dev->device,
171 sizeof(struct ce_pd) * PPC4XX_NUM_PD,
172 &dev->pdr_pa, GFP_KERNEL);
173 if (!dev->pdr)
174 return -ENOMEM;
175
176 dev->pdr_uinfo = kcalloc(PPC4XX_NUM_PD, sizeof(struct pd_uinfo),
177 GFP_KERNEL);
178 if (!dev->pdr_uinfo) {
179 dma_free_coherent(dev->core_dev->device,
180 sizeof(struct ce_pd) * PPC4XX_NUM_PD,
181 dev->pdr,
182 dev->pdr_pa);
183 return -ENOMEM;
184 }
185 dev->shadow_sa_pool = dma_alloc_coherent(dev->core_dev->device,
186 sizeof(union shadow_sa_buf) * PPC4XX_NUM_PD,
187 &dev->shadow_sa_pool_pa,
188 GFP_KERNEL);
189 if (!dev->shadow_sa_pool)
190 return -ENOMEM;
191
192 dev->shadow_sr_pool = dma_alloc_coherent(dev->core_dev->device,
193 sizeof(struct sa_state_record) * PPC4XX_NUM_PD,
194 &dev->shadow_sr_pool_pa, GFP_KERNEL);
195 if (!dev->shadow_sr_pool)
196 return -ENOMEM;
197 for (i = 0; i < PPC4XX_NUM_PD; i++) {
198 struct ce_pd *pd = &dev->pdr[i];
199 struct pd_uinfo *pd_uinfo = &dev->pdr_uinfo[i];
200
201 pd->sa = dev->shadow_sa_pool_pa +
202 sizeof(union shadow_sa_buf) * i;
203
204 /* alloc 256 bytes which is enough for any kind of dynamic sa */
205 pd_uinfo->sa_va = &dev->shadow_sa_pool[i].sa;
206
207 /* alloc state record */
208 pd_uinfo->sr_va = &dev->shadow_sr_pool[i];
209 pd_uinfo->sr_pa = dev->shadow_sr_pool_pa +
210 sizeof(struct sa_state_record) * i;
211 }
212
213 return 0;
214 }
215
crypto4xx_destroy_pdr(struct crypto4xx_device * dev)216 static void crypto4xx_destroy_pdr(struct crypto4xx_device *dev)
217 {
218 if (dev->pdr)
219 dma_free_coherent(dev->core_dev->device,
220 sizeof(struct ce_pd) * PPC4XX_NUM_PD,
221 dev->pdr, dev->pdr_pa);
222
223 if (dev->shadow_sa_pool)
224 dma_free_coherent(dev->core_dev->device,
225 sizeof(union shadow_sa_buf) * PPC4XX_NUM_PD,
226 dev->shadow_sa_pool, dev->shadow_sa_pool_pa);
227
228 if (dev->shadow_sr_pool)
229 dma_free_coherent(dev->core_dev->device,
230 sizeof(struct sa_state_record) * PPC4XX_NUM_PD,
231 dev->shadow_sr_pool, dev->shadow_sr_pool_pa);
232
233 kfree(dev->pdr_uinfo);
234 }
235
crypto4xx_get_pd_from_pdr_nolock(struct crypto4xx_device * dev)236 static u32 crypto4xx_get_pd_from_pdr_nolock(struct crypto4xx_device *dev)
237 {
238 u32 retval;
239 u32 tmp;
240
241 retval = dev->pdr_head;
242 tmp = (dev->pdr_head + 1) % PPC4XX_NUM_PD;
243
244 if (tmp == dev->pdr_tail)
245 return ERING_WAS_FULL;
246
247 dev->pdr_head = tmp;
248
249 return retval;
250 }
251
crypto4xx_put_pd_to_pdr(struct crypto4xx_device * dev,u32 idx)252 static u32 crypto4xx_put_pd_to_pdr(struct crypto4xx_device *dev, u32 idx)
253 {
254 struct pd_uinfo *pd_uinfo = &dev->pdr_uinfo[idx];
255 u32 tail;
256 unsigned long flags;
257
258 spin_lock_irqsave(&dev->core_dev->lock, flags);
259 pd_uinfo->state = PD_ENTRY_FREE;
260
261 if (dev->pdr_tail != PPC4XX_LAST_PD)
262 dev->pdr_tail++;
263 else
264 dev->pdr_tail = 0;
265 tail = dev->pdr_tail;
266 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
267
268 return tail;
269 }
270
271 /*
272 * alloc memory for the gather ring
273 * no need to alloc buf for the ring
274 * gdr_tail, gdr_head and gdr_count are initialized by this function
275 */
crypto4xx_build_gdr(struct crypto4xx_device * dev)276 static u32 crypto4xx_build_gdr(struct crypto4xx_device *dev)
277 {
278 dev->gdr = dma_alloc_coherent(dev->core_dev->device,
279 sizeof(struct ce_gd) * PPC4XX_NUM_GD,
280 &dev->gdr_pa, GFP_KERNEL);
281 if (!dev->gdr)
282 return -ENOMEM;
283
284 return 0;
285 }
286
crypto4xx_destroy_gdr(struct crypto4xx_device * dev)287 static inline void crypto4xx_destroy_gdr(struct crypto4xx_device *dev)
288 {
289 if (dev->gdr)
290 dma_free_coherent(dev->core_dev->device,
291 sizeof(struct ce_gd) * PPC4XX_NUM_GD,
292 dev->gdr, dev->gdr_pa);
293 }
294
295 /*
296 * when this function is called.
297 * preemption or interrupt must be disabled
298 */
crypto4xx_get_n_gd(struct crypto4xx_device * dev,int n)299 static u32 crypto4xx_get_n_gd(struct crypto4xx_device *dev, int n)
300 {
301 u32 retval;
302 u32 tmp;
303
304 if (n >= PPC4XX_NUM_GD)
305 return ERING_WAS_FULL;
306
307 retval = dev->gdr_head;
308 tmp = (dev->gdr_head + n) % PPC4XX_NUM_GD;
309 if (dev->gdr_head > dev->gdr_tail) {
310 if (tmp < dev->gdr_head && tmp >= dev->gdr_tail)
311 return ERING_WAS_FULL;
312 } else if (dev->gdr_head < dev->gdr_tail) {
313 if (tmp < dev->gdr_head || tmp >= dev->gdr_tail)
314 return ERING_WAS_FULL;
315 }
316 dev->gdr_head = tmp;
317
318 return retval;
319 }
320
crypto4xx_put_gd_to_gdr(struct crypto4xx_device * dev)321 static u32 crypto4xx_put_gd_to_gdr(struct crypto4xx_device *dev)
322 {
323 unsigned long flags;
324
325 spin_lock_irqsave(&dev->core_dev->lock, flags);
326 if (dev->gdr_tail == dev->gdr_head) {
327 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
328 return 0;
329 }
330
331 if (dev->gdr_tail != PPC4XX_LAST_GD)
332 dev->gdr_tail++;
333 else
334 dev->gdr_tail = 0;
335
336 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
337
338 return 0;
339 }
340
crypto4xx_get_gdp(struct crypto4xx_device * dev,dma_addr_t * gd_dma,u32 idx)341 static inline struct ce_gd *crypto4xx_get_gdp(struct crypto4xx_device *dev,
342 dma_addr_t *gd_dma, u32 idx)
343 {
344 *gd_dma = dev->gdr_pa + sizeof(struct ce_gd) * idx;
345
346 return &dev->gdr[idx];
347 }
348
349 /*
350 * alloc memory for the scatter ring
351 * need to alloc buf for the ring
352 * sdr_tail, sdr_head and sdr_count are initialized by this function
353 */
crypto4xx_build_sdr(struct crypto4xx_device * dev)354 static u32 crypto4xx_build_sdr(struct crypto4xx_device *dev)
355 {
356 int i;
357
358 dev->scatter_buffer_va =
359 dma_alloc_coherent(dev->core_dev->device,
360 PPC4XX_SD_BUFFER_SIZE * PPC4XX_NUM_SD,
361 &dev->scatter_buffer_pa, GFP_KERNEL);
362 if (!dev->scatter_buffer_va)
363 return -ENOMEM;
364
365 /* alloc memory for scatter descriptor ring */
366 dev->sdr = dma_alloc_coherent(dev->core_dev->device,
367 sizeof(struct ce_sd) * PPC4XX_NUM_SD,
368 &dev->sdr_pa, GFP_KERNEL);
369 if (!dev->sdr)
370 return -ENOMEM;
371
372 for (i = 0; i < PPC4XX_NUM_SD; i++) {
373 dev->sdr[i].ptr = dev->scatter_buffer_pa +
374 PPC4XX_SD_BUFFER_SIZE * i;
375 }
376
377 return 0;
378 }
379
crypto4xx_destroy_sdr(struct crypto4xx_device * dev)380 static void crypto4xx_destroy_sdr(struct crypto4xx_device *dev)
381 {
382 if (dev->sdr)
383 dma_free_coherent(dev->core_dev->device,
384 sizeof(struct ce_sd) * PPC4XX_NUM_SD,
385 dev->sdr, dev->sdr_pa);
386
387 if (dev->scatter_buffer_va)
388 dma_free_coherent(dev->core_dev->device,
389 PPC4XX_SD_BUFFER_SIZE * PPC4XX_NUM_SD,
390 dev->scatter_buffer_va,
391 dev->scatter_buffer_pa);
392 }
393
394 /*
395 * when this function is called.
396 * preemption or interrupt must be disabled
397 */
crypto4xx_get_n_sd(struct crypto4xx_device * dev,int n)398 static u32 crypto4xx_get_n_sd(struct crypto4xx_device *dev, int n)
399 {
400 u32 retval;
401 u32 tmp;
402
403 if (n >= PPC4XX_NUM_SD)
404 return ERING_WAS_FULL;
405
406 retval = dev->sdr_head;
407 tmp = (dev->sdr_head + n) % PPC4XX_NUM_SD;
408 if (dev->sdr_head > dev->gdr_tail) {
409 if (tmp < dev->sdr_head && tmp >= dev->sdr_tail)
410 return ERING_WAS_FULL;
411 } else if (dev->sdr_head < dev->sdr_tail) {
412 if (tmp < dev->sdr_head || tmp >= dev->sdr_tail)
413 return ERING_WAS_FULL;
414 } /* the head = tail, or empty case is already take cared */
415 dev->sdr_head = tmp;
416
417 return retval;
418 }
419
crypto4xx_put_sd_to_sdr(struct crypto4xx_device * dev)420 static u32 crypto4xx_put_sd_to_sdr(struct crypto4xx_device *dev)
421 {
422 unsigned long flags;
423
424 spin_lock_irqsave(&dev->core_dev->lock, flags);
425 if (dev->sdr_tail == dev->sdr_head) {
426 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
427 return 0;
428 }
429 if (dev->sdr_tail != PPC4XX_LAST_SD)
430 dev->sdr_tail++;
431 else
432 dev->sdr_tail = 0;
433 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
434
435 return 0;
436 }
437
crypto4xx_get_sdp(struct crypto4xx_device * dev,dma_addr_t * sd_dma,u32 idx)438 static inline struct ce_sd *crypto4xx_get_sdp(struct crypto4xx_device *dev,
439 dma_addr_t *sd_dma, u32 idx)
440 {
441 *sd_dma = dev->sdr_pa + sizeof(struct ce_sd) * idx;
442
443 return &dev->sdr[idx];
444 }
445
crypto4xx_copy_pkt_to_dst(struct crypto4xx_device * dev,struct ce_pd * pd,struct pd_uinfo * pd_uinfo,u32 nbytes,struct scatterlist * dst)446 static void crypto4xx_copy_pkt_to_dst(struct crypto4xx_device *dev,
447 struct ce_pd *pd,
448 struct pd_uinfo *pd_uinfo,
449 u32 nbytes,
450 struct scatterlist *dst)
451 {
452 unsigned int first_sd = pd_uinfo->first_sd;
453 unsigned int last_sd;
454 unsigned int overflow = 0;
455 unsigned int to_copy;
456 unsigned int dst_start = 0;
457
458 /*
459 * Because the scatter buffers are all neatly organized in one
460 * big continuous ringbuffer; scatterwalk_map_and_copy() can
461 * be instructed to copy a range of buffers in one go.
462 */
463
464 last_sd = (first_sd + pd_uinfo->num_sd);
465 if (last_sd > PPC4XX_LAST_SD) {
466 last_sd = PPC4XX_LAST_SD;
467 overflow = last_sd % PPC4XX_NUM_SD;
468 }
469
470 while (nbytes) {
471 void *buf = dev->scatter_buffer_va +
472 first_sd * PPC4XX_SD_BUFFER_SIZE;
473
474 to_copy = min(nbytes, PPC4XX_SD_BUFFER_SIZE *
475 (1 + last_sd - first_sd));
476 scatterwalk_map_and_copy(buf, dst, dst_start, to_copy, 1);
477 nbytes -= to_copy;
478
479 if (overflow) {
480 first_sd = 0;
481 last_sd = overflow;
482 dst_start += to_copy;
483 overflow = 0;
484 }
485 }
486 }
487
crypto4xx_copy_digest_to_dst(void * dst,struct pd_uinfo * pd_uinfo,struct crypto4xx_ctx * ctx)488 static void crypto4xx_copy_digest_to_dst(void *dst,
489 struct pd_uinfo *pd_uinfo,
490 struct crypto4xx_ctx *ctx)
491 {
492 struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *) ctx->sa_in;
493
494 if (sa->sa_command_0.bf.hash_alg == SA_HASH_ALG_SHA1) {
495 memcpy(dst, pd_uinfo->sr_va->save_digest,
496 SA_HASH_ALG_SHA1_DIGEST_SIZE);
497 }
498 }
499
crypto4xx_ret_sg_desc(struct crypto4xx_device * dev,struct pd_uinfo * pd_uinfo)500 static void crypto4xx_ret_sg_desc(struct crypto4xx_device *dev,
501 struct pd_uinfo *pd_uinfo)
502 {
503 int i;
504 if (pd_uinfo->num_gd) {
505 for (i = 0; i < pd_uinfo->num_gd; i++)
506 crypto4xx_put_gd_to_gdr(dev);
507 pd_uinfo->first_gd = 0xffffffff;
508 pd_uinfo->num_gd = 0;
509 }
510 if (pd_uinfo->num_sd) {
511 for (i = 0; i < pd_uinfo->num_sd; i++)
512 crypto4xx_put_sd_to_sdr(dev);
513
514 pd_uinfo->first_sd = 0xffffffff;
515 pd_uinfo->num_sd = 0;
516 }
517 }
518
crypto4xx_cipher_done(struct crypto4xx_device * dev,struct pd_uinfo * pd_uinfo,struct ce_pd * pd)519 static void crypto4xx_cipher_done(struct crypto4xx_device *dev,
520 struct pd_uinfo *pd_uinfo,
521 struct ce_pd *pd)
522 {
523 struct skcipher_request *req;
524 struct scatterlist *dst;
525 dma_addr_t addr;
526
527 req = skcipher_request_cast(pd_uinfo->async_req);
528
529 if (pd_uinfo->sa_va->sa_command_0.bf.scatter) {
530 crypto4xx_copy_pkt_to_dst(dev, pd, pd_uinfo,
531 req->cryptlen, req->dst);
532 } else {
533 dst = pd_uinfo->dest_va;
534 addr = dma_map_page(dev->core_dev->device, sg_page(dst),
535 dst->offset, dst->length, DMA_FROM_DEVICE);
536 }
537
538 if (pd_uinfo->sa_va->sa_command_0.bf.save_iv == SA_SAVE_IV) {
539 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
540
541 crypto4xx_memcpy_from_le32((u32 *)req->iv,
542 pd_uinfo->sr_va->save_iv,
543 crypto_skcipher_ivsize(skcipher));
544 }
545
546 crypto4xx_ret_sg_desc(dev, pd_uinfo);
547
548 if (pd_uinfo->state & PD_ENTRY_BUSY)
549 skcipher_request_complete(req, -EINPROGRESS);
550 skcipher_request_complete(req, 0);
551 }
552
crypto4xx_ahash_done(struct crypto4xx_device * dev,struct pd_uinfo * pd_uinfo)553 static void crypto4xx_ahash_done(struct crypto4xx_device *dev,
554 struct pd_uinfo *pd_uinfo)
555 {
556 struct crypto4xx_ctx *ctx;
557 struct ahash_request *ahash_req;
558
559 ahash_req = ahash_request_cast(pd_uinfo->async_req);
560 ctx = crypto_tfm_ctx(ahash_req->base.tfm);
561
562 crypto4xx_copy_digest_to_dst(ahash_req->result, pd_uinfo,
563 crypto_tfm_ctx(ahash_req->base.tfm));
564 crypto4xx_ret_sg_desc(dev, pd_uinfo);
565
566 if (pd_uinfo->state & PD_ENTRY_BUSY)
567 ahash_request_complete(ahash_req, -EINPROGRESS);
568 ahash_request_complete(ahash_req, 0);
569 }
570
crypto4xx_aead_done(struct crypto4xx_device * dev,struct pd_uinfo * pd_uinfo,struct ce_pd * pd)571 static void crypto4xx_aead_done(struct crypto4xx_device *dev,
572 struct pd_uinfo *pd_uinfo,
573 struct ce_pd *pd)
574 {
575 struct aead_request *aead_req = container_of(pd_uinfo->async_req,
576 struct aead_request, base);
577 struct scatterlist *dst = pd_uinfo->dest_va;
578 size_t cp_len = crypto_aead_authsize(
579 crypto_aead_reqtfm(aead_req));
580 u32 icv[AES_BLOCK_SIZE];
581 int err = 0;
582
583 if (pd_uinfo->sa_va->sa_command_0.bf.scatter) {
584 crypto4xx_copy_pkt_to_dst(dev, pd, pd_uinfo,
585 pd->pd_ctl_len.bf.pkt_len,
586 dst);
587 } else {
588 dma_unmap_page(dev->core_dev->device, pd->dest, dst->length,
589 DMA_FROM_DEVICE);
590 }
591
592 if (pd_uinfo->sa_va->sa_command_0.bf.dir == DIR_OUTBOUND) {
593 /* append icv at the end */
594 crypto4xx_memcpy_from_le32(icv, pd_uinfo->sr_va->save_digest,
595 sizeof(icv));
596
597 scatterwalk_map_and_copy(icv, dst, aead_req->cryptlen,
598 cp_len, 1);
599 } else {
600 /* check icv at the end */
601 scatterwalk_map_and_copy(icv, aead_req->src,
602 aead_req->assoclen + aead_req->cryptlen -
603 cp_len, cp_len, 0);
604
605 crypto4xx_memcpy_from_le32(icv, icv, sizeof(icv));
606
607 if (crypto_memneq(icv, pd_uinfo->sr_va->save_digest, cp_len))
608 err = -EBADMSG;
609 }
610
611 crypto4xx_ret_sg_desc(dev, pd_uinfo);
612
613 if (pd->pd_ctl.bf.status & 0xff) {
614 if (!__ratelimit(&dev->aead_ratelimit)) {
615 if (pd->pd_ctl.bf.status & 2)
616 pr_err("pad fail error\n");
617 if (pd->pd_ctl.bf.status & 4)
618 pr_err("seqnum fail\n");
619 if (pd->pd_ctl.bf.status & 8)
620 pr_err("error _notify\n");
621 pr_err("aead return err status = 0x%02x\n",
622 pd->pd_ctl.bf.status & 0xff);
623 pr_err("pd pad_ctl = 0x%08x\n",
624 pd->pd_ctl.bf.pd_pad_ctl);
625 }
626 err = -EINVAL;
627 }
628
629 if (pd_uinfo->state & PD_ENTRY_BUSY)
630 aead_request_complete(aead_req, -EINPROGRESS);
631
632 aead_request_complete(aead_req, err);
633 }
634
crypto4xx_pd_done(struct crypto4xx_device * dev,u32 idx)635 static void crypto4xx_pd_done(struct crypto4xx_device *dev, u32 idx)
636 {
637 struct ce_pd *pd = &dev->pdr[idx];
638 struct pd_uinfo *pd_uinfo = &dev->pdr_uinfo[idx];
639
640 switch (crypto_tfm_alg_type(pd_uinfo->async_req->tfm)) {
641 case CRYPTO_ALG_TYPE_SKCIPHER:
642 crypto4xx_cipher_done(dev, pd_uinfo, pd);
643 break;
644 case CRYPTO_ALG_TYPE_AEAD:
645 crypto4xx_aead_done(dev, pd_uinfo, pd);
646 break;
647 case CRYPTO_ALG_TYPE_AHASH:
648 crypto4xx_ahash_done(dev, pd_uinfo);
649 break;
650 }
651 }
652
crypto4xx_stop_all(struct crypto4xx_core_device * core_dev)653 static void crypto4xx_stop_all(struct crypto4xx_core_device *core_dev)
654 {
655 crypto4xx_destroy_pdr(core_dev->dev);
656 crypto4xx_destroy_gdr(core_dev->dev);
657 crypto4xx_destroy_sdr(core_dev->dev);
658 iounmap(core_dev->dev->ce_base);
659 kfree(core_dev->dev);
660 kfree(core_dev);
661 }
662
get_next_gd(u32 current)663 static u32 get_next_gd(u32 current)
664 {
665 if (current != PPC4XX_LAST_GD)
666 return current + 1;
667 else
668 return 0;
669 }
670
get_next_sd(u32 current)671 static u32 get_next_sd(u32 current)
672 {
673 if (current != PPC4XX_LAST_SD)
674 return current + 1;
675 else
676 return 0;
677 }
678
crypto4xx_build_pd(struct crypto_async_request * req,struct crypto4xx_ctx * ctx,struct scatterlist * src,struct scatterlist * dst,const unsigned int datalen,const __le32 * iv,const u32 iv_len,const struct dynamic_sa_ctl * req_sa,const unsigned int sa_len,const unsigned int assoclen,struct scatterlist * _dst)679 int crypto4xx_build_pd(struct crypto_async_request *req,
680 struct crypto4xx_ctx *ctx,
681 struct scatterlist *src,
682 struct scatterlist *dst,
683 const unsigned int datalen,
684 const __le32 *iv, const u32 iv_len,
685 const struct dynamic_sa_ctl *req_sa,
686 const unsigned int sa_len,
687 const unsigned int assoclen,
688 struct scatterlist *_dst)
689 {
690 struct crypto4xx_device *dev = ctx->dev;
691 struct dynamic_sa_ctl *sa;
692 struct ce_gd *gd;
693 struct ce_pd *pd;
694 u32 num_gd, num_sd;
695 u32 fst_gd = 0xffffffff;
696 u32 fst_sd = 0xffffffff;
697 u32 pd_entry;
698 unsigned long flags;
699 struct pd_uinfo *pd_uinfo;
700 unsigned int nbytes = datalen;
701 size_t offset_to_sr_ptr;
702 u32 gd_idx = 0;
703 int tmp;
704 bool is_busy, force_sd;
705
706 /*
707 * There's a very subtile/disguised "bug" in the hardware that
708 * gets indirectly mentioned in 18.1.3.5 Encryption/Decryption
709 * of the hardware spec:
710 * *drum roll* the AES/(T)DES OFB and CFB modes are listed as
711 * operation modes for >>> "Block ciphers" <<<.
712 *
713 * To workaround this issue and stop the hardware from causing
714 * "overran dst buffer" on crypttexts that are not a multiple
715 * of 16 (AES_BLOCK_SIZE), we force the driver to use the
716 * scatter buffers.
717 */
718 force_sd = (req_sa->sa_command_1.bf.crypto_mode9_8 == CRYPTO_MODE_CFB
719 || req_sa->sa_command_1.bf.crypto_mode9_8 == CRYPTO_MODE_OFB)
720 && (datalen % AES_BLOCK_SIZE);
721
722 /* figure how many gd are needed */
723 tmp = sg_nents_for_len(src, assoclen + datalen);
724 if (tmp < 0) {
725 dev_err(dev->core_dev->device, "Invalid number of src SG.\n");
726 return tmp;
727 }
728 if (tmp == 1)
729 tmp = 0;
730 num_gd = tmp;
731
732 if (assoclen) {
733 nbytes += assoclen;
734 dst = scatterwalk_ffwd(_dst, dst, assoclen);
735 }
736
737 /* figure how many sd are needed */
738 if (sg_is_last(dst) && force_sd == false) {
739 num_sd = 0;
740 } else {
741 if (datalen > PPC4XX_SD_BUFFER_SIZE) {
742 num_sd = datalen / PPC4XX_SD_BUFFER_SIZE;
743 if (datalen % PPC4XX_SD_BUFFER_SIZE)
744 num_sd++;
745 } else {
746 num_sd = 1;
747 }
748 }
749
750 /*
751 * The follow section of code needs to be protected
752 * The gather ring and scatter ring needs to be consecutive
753 * In case of run out of any kind of descriptor, the descriptor
754 * already got must be return the original place.
755 */
756 spin_lock_irqsave(&dev->core_dev->lock, flags);
757 /*
758 * Let the caller know to slow down, once more than 13/16ths = 81%
759 * of the available data contexts are being used simultaneously.
760 *
761 * With PPC4XX_NUM_PD = 256, this will leave a "backlog queue" for
762 * 31 more contexts. Before new requests have to be rejected.
763 */
764 if (req->flags & CRYPTO_TFM_REQ_MAY_BACKLOG) {
765 is_busy = ((dev->pdr_head - dev->pdr_tail) % PPC4XX_NUM_PD) >=
766 ((PPC4XX_NUM_PD * 13) / 16);
767 } else {
768 /*
769 * To fix contention issues between ipsec (no blacklog) and
770 * dm-crypto (backlog) reserve 32 entries for "no backlog"
771 * data contexts.
772 */
773 is_busy = ((dev->pdr_head - dev->pdr_tail) % PPC4XX_NUM_PD) >=
774 ((PPC4XX_NUM_PD * 15) / 16);
775
776 if (is_busy) {
777 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
778 return -EBUSY;
779 }
780 }
781
782 if (num_gd) {
783 fst_gd = crypto4xx_get_n_gd(dev, num_gd);
784 if (fst_gd == ERING_WAS_FULL) {
785 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
786 return -EAGAIN;
787 }
788 }
789 if (num_sd) {
790 fst_sd = crypto4xx_get_n_sd(dev, num_sd);
791 if (fst_sd == ERING_WAS_FULL) {
792 if (num_gd)
793 dev->gdr_head = fst_gd;
794 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
795 return -EAGAIN;
796 }
797 }
798 pd_entry = crypto4xx_get_pd_from_pdr_nolock(dev);
799 if (pd_entry == ERING_WAS_FULL) {
800 if (num_gd)
801 dev->gdr_head = fst_gd;
802 if (num_sd)
803 dev->sdr_head = fst_sd;
804 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
805 return -EAGAIN;
806 }
807 spin_unlock_irqrestore(&dev->core_dev->lock, flags);
808
809 pd = &dev->pdr[pd_entry];
810 pd->sa_len = sa_len;
811
812 pd_uinfo = &dev->pdr_uinfo[pd_entry];
813 pd_uinfo->num_gd = num_gd;
814 pd_uinfo->num_sd = num_sd;
815 pd_uinfo->dest_va = dst;
816 pd_uinfo->async_req = req;
817
818 if (iv_len)
819 memcpy(pd_uinfo->sr_va->save_iv, iv, iv_len);
820
821 sa = pd_uinfo->sa_va;
822 memcpy(sa, req_sa, sa_len * 4);
823
824 sa->sa_command_1.bf.hash_crypto_offset = (assoclen >> 2);
825 offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(sa);
826 *(u32 *)((unsigned long)sa + offset_to_sr_ptr) = pd_uinfo->sr_pa;
827
828 if (num_gd) {
829 dma_addr_t gd_dma;
830 struct scatterlist *sg;
831
832 /* get first gd we are going to use */
833 gd_idx = fst_gd;
834 pd_uinfo->first_gd = fst_gd;
835 gd = crypto4xx_get_gdp(dev, &gd_dma, gd_idx);
836 pd->src = gd_dma;
837 /* enable gather */
838 sa->sa_command_0.bf.gather = 1;
839 /* walk the sg, and setup gather array */
840
841 sg = src;
842 while (nbytes) {
843 size_t len;
844
845 len = min(sg->length, nbytes);
846 gd->ptr = dma_map_page(dev->core_dev->device,
847 sg_page(sg), sg->offset, len, DMA_TO_DEVICE);
848 gd->ctl_len.len = len;
849 gd->ctl_len.done = 0;
850 gd->ctl_len.ready = 1;
851 if (len >= nbytes)
852 break;
853
854 nbytes -= sg->length;
855 gd_idx = get_next_gd(gd_idx);
856 gd = crypto4xx_get_gdp(dev, &gd_dma, gd_idx);
857 sg = sg_next(sg);
858 }
859 } else {
860 pd->src = (u32)dma_map_page(dev->core_dev->device, sg_page(src),
861 src->offset, min(nbytes, src->length),
862 DMA_TO_DEVICE);
863 /*
864 * Disable gather in sa command
865 */
866 sa->sa_command_0.bf.gather = 0;
867 /*
868 * Indicate gather array is not used
869 */
870 pd_uinfo->first_gd = 0xffffffff;
871 }
872 if (!num_sd) {
873 /*
874 * we know application give us dst a whole piece of memory
875 * no need to use scatter ring.
876 */
877 pd_uinfo->first_sd = 0xffffffff;
878 sa->sa_command_0.bf.scatter = 0;
879 pd->dest = (u32)dma_map_page(dev->core_dev->device,
880 sg_page(dst), dst->offset,
881 min(datalen, dst->length),
882 DMA_TO_DEVICE);
883 } else {
884 dma_addr_t sd_dma;
885 struct ce_sd *sd = NULL;
886
887 u32 sd_idx = fst_sd;
888 nbytes = datalen;
889 sa->sa_command_0.bf.scatter = 1;
890 pd_uinfo->first_sd = fst_sd;
891 sd = crypto4xx_get_sdp(dev, &sd_dma, sd_idx);
892 pd->dest = sd_dma;
893 /* setup scatter descriptor */
894 sd->ctl.done = 0;
895 sd->ctl.rdy = 1;
896 /* sd->ptr should be setup by sd_init routine*/
897 if (nbytes >= PPC4XX_SD_BUFFER_SIZE)
898 nbytes -= PPC4XX_SD_BUFFER_SIZE;
899 else
900 nbytes = 0;
901 while (nbytes) {
902 sd_idx = get_next_sd(sd_idx);
903 sd = crypto4xx_get_sdp(dev, &sd_dma, sd_idx);
904 /* setup scatter descriptor */
905 sd->ctl.done = 0;
906 sd->ctl.rdy = 1;
907 if (nbytes >= PPC4XX_SD_BUFFER_SIZE) {
908 nbytes -= PPC4XX_SD_BUFFER_SIZE;
909 } else {
910 /*
911 * SD entry can hold PPC4XX_SD_BUFFER_SIZE,
912 * which is more than nbytes, so done.
913 */
914 nbytes = 0;
915 }
916 }
917 }
918
919 pd->pd_ctl.w = PD_CTL_HOST_READY |
920 ((crypto_tfm_alg_type(req->tfm) == CRYPTO_ALG_TYPE_AHASH) ||
921 (crypto_tfm_alg_type(req->tfm) == CRYPTO_ALG_TYPE_AEAD) ?
922 PD_CTL_HASH_FINAL : 0);
923 pd->pd_ctl_len.w = 0x00400000 | (assoclen + datalen);
924 pd_uinfo->state = PD_ENTRY_INUSE | (is_busy ? PD_ENTRY_BUSY : 0);
925
926 wmb();
927 /* write any value to push engine to read a pd */
928 writel(0, dev->ce_base + CRYPTO4XX_INT_DESCR_RD);
929 writel(1, dev->ce_base + CRYPTO4XX_INT_DESCR_RD);
930 return is_busy ? -EBUSY : -EINPROGRESS;
931 }
932
933 /*
934 * Algorithm Registration Functions
935 */
crypto4xx_ctx_init(struct crypto4xx_alg * amcc_alg,struct crypto4xx_ctx * ctx)936 static void crypto4xx_ctx_init(struct crypto4xx_alg *amcc_alg,
937 struct crypto4xx_ctx *ctx)
938 {
939 ctx->dev = amcc_alg->dev;
940 ctx->sa_in = NULL;
941 ctx->sa_out = NULL;
942 ctx->sa_len = 0;
943 }
944
crypto4xx_sk_init(struct crypto_skcipher * sk)945 static int crypto4xx_sk_init(struct crypto_skcipher *sk)
946 {
947 struct skcipher_alg *alg = crypto_skcipher_alg(sk);
948 struct crypto4xx_alg *amcc_alg;
949 struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(sk);
950
951 if (alg->base.cra_flags & CRYPTO_ALG_NEED_FALLBACK) {
952 ctx->sw_cipher.cipher =
953 crypto_alloc_sync_skcipher(alg->base.cra_name, 0,
954 CRYPTO_ALG_NEED_FALLBACK);
955 if (IS_ERR(ctx->sw_cipher.cipher))
956 return PTR_ERR(ctx->sw_cipher.cipher);
957 }
958
959 amcc_alg = container_of(alg, struct crypto4xx_alg, alg.u.cipher);
960 crypto4xx_ctx_init(amcc_alg, ctx);
961 return 0;
962 }
963
crypto4xx_common_exit(struct crypto4xx_ctx * ctx)964 static void crypto4xx_common_exit(struct crypto4xx_ctx *ctx)
965 {
966 crypto4xx_free_sa(ctx);
967 }
968
crypto4xx_sk_exit(struct crypto_skcipher * sk)969 static void crypto4xx_sk_exit(struct crypto_skcipher *sk)
970 {
971 struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(sk);
972
973 crypto4xx_common_exit(ctx);
974 if (ctx->sw_cipher.cipher)
975 crypto_free_sync_skcipher(ctx->sw_cipher.cipher);
976 }
977
crypto4xx_aead_init(struct crypto_aead * tfm)978 static int crypto4xx_aead_init(struct crypto_aead *tfm)
979 {
980 struct aead_alg *alg = crypto_aead_alg(tfm);
981 struct crypto4xx_ctx *ctx = crypto_aead_ctx(tfm);
982 struct crypto4xx_alg *amcc_alg;
983
984 ctx->sw_cipher.aead = crypto_alloc_aead(alg->base.cra_name, 0,
985 CRYPTO_ALG_NEED_FALLBACK |
986 CRYPTO_ALG_ASYNC);
987 if (IS_ERR(ctx->sw_cipher.aead))
988 return PTR_ERR(ctx->sw_cipher.aead);
989
990 amcc_alg = container_of(alg, struct crypto4xx_alg, alg.u.aead);
991 crypto4xx_ctx_init(amcc_alg, ctx);
992 crypto_aead_set_reqsize(tfm, max(sizeof(struct aead_request) + 32 +
993 crypto_aead_reqsize(ctx->sw_cipher.aead),
994 sizeof(struct crypto4xx_aead_reqctx)));
995 return 0;
996 }
997
crypto4xx_aead_exit(struct crypto_aead * tfm)998 static void crypto4xx_aead_exit(struct crypto_aead *tfm)
999 {
1000 struct crypto4xx_ctx *ctx = crypto_aead_ctx(tfm);
1001
1002 crypto4xx_common_exit(ctx);
1003 crypto_free_aead(ctx->sw_cipher.aead);
1004 }
1005
crypto4xx_register_alg(struct crypto4xx_device * sec_dev,struct crypto4xx_alg_common * crypto_alg,int array_size)1006 static int crypto4xx_register_alg(struct crypto4xx_device *sec_dev,
1007 struct crypto4xx_alg_common *crypto_alg,
1008 int array_size)
1009 {
1010 struct crypto4xx_alg *alg;
1011 int i;
1012 int rc = 0;
1013
1014 for (i = 0; i < array_size; i++) {
1015 alg = kzalloc(sizeof(struct crypto4xx_alg), GFP_KERNEL);
1016 if (!alg)
1017 return -ENOMEM;
1018
1019 alg->alg = crypto_alg[i];
1020 alg->dev = sec_dev;
1021
1022 switch (alg->alg.type) {
1023 case CRYPTO_ALG_TYPE_AEAD:
1024 rc = crypto_register_aead(&alg->alg.u.aead);
1025 break;
1026
1027 case CRYPTO_ALG_TYPE_AHASH:
1028 rc = crypto_register_ahash(&alg->alg.u.hash);
1029 break;
1030
1031 case CRYPTO_ALG_TYPE_RNG:
1032 rc = crypto_register_rng(&alg->alg.u.rng);
1033 break;
1034
1035 default:
1036 rc = crypto_register_skcipher(&alg->alg.u.cipher);
1037 break;
1038 }
1039
1040 if (rc)
1041 kfree(alg);
1042 else
1043 list_add_tail(&alg->entry, &sec_dev->alg_list);
1044 }
1045
1046 return 0;
1047 }
1048
crypto4xx_unregister_alg(struct crypto4xx_device * sec_dev)1049 static void crypto4xx_unregister_alg(struct crypto4xx_device *sec_dev)
1050 {
1051 struct crypto4xx_alg *alg, *tmp;
1052
1053 list_for_each_entry_safe(alg, tmp, &sec_dev->alg_list, entry) {
1054 list_del(&alg->entry);
1055 switch (alg->alg.type) {
1056 case CRYPTO_ALG_TYPE_AHASH:
1057 crypto_unregister_ahash(&alg->alg.u.hash);
1058 break;
1059
1060 case CRYPTO_ALG_TYPE_AEAD:
1061 crypto_unregister_aead(&alg->alg.u.aead);
1062 break;
1063
1064 case CRYPTO_ALG_TYPE_RNG:
1065 crypto_unregister_rng(&alg->alg.u.rng);
1066 break;
1067
1068 default:
1069 crypto_unregister_skcipher(&alg->alg.u.cipher);
1070 }
1071 kfree(alg);
1072 }
1073 }
1074
crypto4xx_bh_tasklet_cb(unsigned long data)1075 static void crypto4xx_bh_tasklet_cb(unsigned long data)
1076 {
1077 struct device *dev = (struct device *)data;
1078 struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev);
1079 struct pd_uinfo *pd_uinfo;
1080 struct ce_pd *pd;
1081 u32 tail = core_dev->dev->pdr_tail;
1082 u32 head = core_dev->dev->pdr_head;
1083
1084 do {
1085 pd_uinfo = &core_dev->dev->pdr_uinfo[tail];
1086 pd = &core_dev->dev->pdr[tail];
1087 if ((pd_uinfo->state & PD_ENTRY_INUSE) &&
1088 ((READ_ONCE(pd->pd_ctl.w) &
1089 (PD_CTL_PE_DONE | PD_CTL_HOST_READY)) ==
1090 PD_CTL_PE_DONE)) {
1091 crypto4xx_pd_done(core_dev->dev, tail);
1092 tail = crypto4xx_put_pd_to_pdr(core_dev->dev, tail);
1093 } else {
1094 /* if tail not done, break */
1095 break;
1096 }
1097 } while (head != tail);
1098 }
1099
1100 /*
1101 * Top Half of isr.
1102 */
crypto4xx_interrupt_handler(int irq,void * data,u32 clr_val)1103 static inline irqreturn_t crypto4xx_interrupt_handler(int irq, void *data,
1104 u32 clr_val)
1105 {
1106 struct device *dev = (struct device *)data;
1107 struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev);
1108
1109 writel(clr_val, core_dev->dev->ce_base + CRYPTO4XX_INT_CLR);
1110 tasklet_schedule(&core_dev->tasklet);
1111
1112 return IRQ_HANDLED;
1113 }
1114
crypto4xx_ce_interrupt_handler(int irq,void * data)1115 static irqreturn_t crypto4xx_ce_interrupt_handler(int irq, void *data)
1116 {
1117 return crypto4xx_interrupt_handler(irq, data, PPC4XX_INTERRUPT_CLR);
1118 }
1119
crypto4xx_ce_interrupt_handler_revb(int irq,void * data)1120 static irqreturn_t crypto4xx_ce_interrupt_handler_revb(int irq, void *data)
1121 {
1122 return crypto4xx_interrupt_handler(irq, data, PPC4XX_INTERRUPT_CLR |
1123 PPC4XX_TMO_ERR_INT);
1124 }
1125
ppc4xx_prng_data_read(struct crypto4xx_device * dev,u8 * data,unsigned int max)1126 static int ppc4xx_prng_data_read(struct crypto4xx_device *dev,
1127 u8 *data, unsigned int max)
1128 {
1129 unsigned int i, curr = 0;
1130 u32 val[2];
1131
1132 do {
1133 /* trigger PRN generation */
1134 writel(PPC4XX_PRNG_CTRL_AUTO_EN,
1135 dev->ce_base + CRYPTO4XX_PRNG_CTRL);
1136
1137 for (i = 0; i < 1024; i++) {
1138 /* usually 19 iterations are enough */
1139 if ((readl(dev->ce_base + CRYPTO4XX_PRNG_STAT) &
1140 CRYPTO4XX_PRNG_STAT_BUSY))
1141 continue;
1142
1143 val[0] = readl_be(dev->ce_base + CRYPTO4XX_PRNG_RES_0);
1144 val[1] = readl_be(dev->ce_base + CRYPTO4XX_PRNG_RES_1);
1145 break;
1146 }
1147 if (i == 1024)
1148 return -ETIMEDOUT;
1149
1150 if ((max - curr) >= 8) {
1151 memcpy(data, &val, 8);
1152 data += 8;
1153 curr += 8;
1154 } else {
1155 /* copy only remaining bytes */
1156 memcpy(data, &val, max - curr);
1157 break;
1158 }
1159 } while (curr < max);
1160
1161 return curr;
1162 }
1163
crypto4xx_prng_generate(struct crypto_rng * tfm,const u8 * src,unsigned int slen,u8 * dstn,unsigned int dlen)1164 static int crypto4xx_prng_generate(struct crypto_rng *tfm,
1165 const u8 *src, unsigned int slen,
1166 u8 *dstn, unsigned int dlen)
1167 {
1168 struct rng_alg *alg = crypto_rng_alg(tfm);
1169 struct crypto4xx_alg *amcc_alg;
1170 struct crypto4xx_device *dev;
1171 int ret;
1172
1173 amcc_alg = container_of(alg, struct crypto4xx_alg, alg.u.rng);
1174 dev = amcc_alg->dev;
1175
1176 mutex_lock(&dev->core_dev->rng_lock);
1177 ret = ppc4xx_prng_data_read(dev, dstn, dlen);
1178 mutex_unlock(&dev->core_dev->rng_lock);
1179 return ret;
1180 }
1181
1182
crypto4xx_prng_seed(struct crypto_rng * tfm,const u8 * seed,unsigned int slen)1183 static int crypto4xx_prng_seed(struct crypto_rng *tfm, const u8 *seed,
1184 unsigned int slen)
1185 {
1186 return 0;
1187 }
1188
1189 /*
1190 * Supported Crypto Algorithms
1191 */
1192 static struct crypto4xx_alg_common crypto4xx_alg[] = {
1193 /* Crypto AES modes */
1194 { .type = CRYPTO_ALG_TYPE_SKCIPHER, .u.cipher = {
1195 .base = {
1196 .cra_name = "cbc(aes)",
1197 .cra_driver_name = "cbc-aes-ppc4xx",
1198 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY,
1199 .cra_flags = CRYPTO_ALG_ASYNC |
1200 CRYPTO_ALG_KERN_DRIVER_ONLY,
1201 .cra_blocksize = AES_BLOCK_SIZE,
1202 .cra_ctxsize = sizeof(struct crypto4xx_ctx),
1203 .cra_module = THIS_MODULE,
1204 },
1205 .min_keysize = AES_MIN_KEY_SIZE,
1206 .max_keysize = AES_MAX_KEY_SIZE,
1207 .ivsize = AES_IV_SIZE,
1208 .setkey = crypto4xx_setkey_aes_cbc,
1209 .encrypt = crypto4xx_encrypt_iv_block,
1210 .decrypt = crypto4xx_decrypt_iv_block,
1211 .init = crypto4xx_sk_init,
1212 .exit = crypto4xx_sk_exit,
1213 } },
1214 { .type = CRYPTO_ALG_TYPE_SKCIPHER, .u.cipher = {
1215 .base = {
1216 .cra_name = "cfb(aes)",
1217 .cra_driver_name = "cfb-aes-ppc4xx",
1218 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY,
1219 .cra_flags = CRYPTO_ALG_ASYNC |
1220 CRYPTO_ALG_KERN_DRIVER_ONLY,
1221 .cra_blocksize = 1,
1222 .cra_ctxsize = sizeof(struct crypto4xx_ctx),
1223 .cra_module = THIS_MODULE,
1224 },
1225 .min_keysize = AES_MIN_KEY_SIZE,
1226 .max_keysize = AES_MAX_KEY_SIZE,
1227 .ivsize = AES_IV_SIZE,
1228 .setkey = crypto4xx_setkey_aes_cfb,
1229 .encrypt = crypto4xx_encrypt_iv_stream,
1230 .decrypt = crypto4xx_decrypt_iv_stream,
1231 .init = crypto4xx_sk_init,
1232 .exit = crypto4xx_sk_exit,
1233 } },
1234 { .type = CRYPTO_ALG_TYPE_SKCIPHER, .u.cipher = {
1235 .base = {
1236 .cra_name = "ctr(aes)",
1237 .cra_driver_name = "ctr-aes-ppc4xx",
1238 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY,
1239 .cra_flags = CRYPTO_ALG_NEED_FALLBACK |
1240 CRYPTO_ALG_ASYNC |
1241 CRYPTO_ALG_KERN_DRIVER_ONLY,
1242 .cra_blocksize = 1,
1243 .cra_ctxsize = sizeof(struct crypto4xx_ctx),
1244 .cra_module = THIS_MODULE,
1245 },
1246 .min_keysize = AES_MIN_KEY_SIZE,
1247 .max_keysize = AES_MAX_KEY_SIZE,
1248 .ivsize = AES_IV_SIZE,
1249 .setkey = crypto4xx_setkey_aes_ctr,
1250 .encrypt = crypto4xx_encrypt_ctr,
1251 .decrypt = crypto4xx_decrypt_ctr,
1252 .init = crypto4xx_sk_init,
1253 .exit = crypto4xx_sk_exit,
1254 } },
1255 { .type = CRYPTO_ALG_TYPE_SKCIPHER, .u.cipher = {
1256 .base = {
1257 .cra_name = "rfc3686(ctr(aes))",
1258 .cra_driver_name = "rfc3686-ctr-aes-ppc4xx",
1259 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY,
1260 .cra_flags = CRYPTO_ALG_ASYNC |
1261 CRYPTO_ALG_KERN_DRIVER_ONLY,
1262 .cra_blocksize = 1,
1263 .cra_ctxsize = sizeof(struct crypto4xx_ctx),
1264 .cra_module = THIS_MODULE,
1265 },
1266 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
1267 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
1268 .ivsize = CTR_RFC3686_IV_SIZE,
1269 .setkey = crypto4xx_setkey_rfc3686,
1270 .encrypt = crypto4xx_rfc3686_encrypt,
1271 .decrypt = crypto4xx_rfc3686_decrypt,
1272 .init = crypto4xx_sk_init,
1273 .exit = crypto4xx_sk_exit,
1274 } },
1275 { .type = CRYPTO_ALG_TYPE_SKCIPHER, .u.cipher = {
1276 .base = {
1277 .cra_name = "ecb(aes)",
1278 .cra_driver_name = "ecb-aes-ppc4xx",
1279 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY,
1280 .cra_flags = CRYPTO_ALG_ASYNC |
1281 CRYPTO_ALG_KERN_DRIVER_ONLY,
1282 .cra_blocksize = AES_BLOCK_SIZE,
1283 .cra_ctxsize = sizeof(struct crypto4xx_ctx),
1284 .cra_module = THIS_MODULE,
1285 },
1286 .min_keysize = AES_MIN_KEY_SIZE,
1287 .max_keysize = AES_MAX_KEY_SIZE,
1288 .setkey = crypto4xx_setkey_aes_ecb,
1289 .encrypt = crypto4xx_encrypt_noiv_block,
1290 .decrypt = crypto4xx_decrypt_noiv_block,
1291 .init = crypto4xx_sk_init,
1292 .exit = crypto4xx_sk_exit,
1293 } },
1294 { .type = CRYPTO_ALG_TYPE_SKCIPHER, .u.cipher = {
1295 .base = {
1296 .cra_name = "ofb(aes)",
1297 .cra_driver_name = "ofb-aes-ppc4xx",
1298 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY,
1299 .cra_flags = CRYPTO_ALG_ASYNC |
1300 CRYPTO_ALG_KERN_DRIVER_ONLY,
1301 .cra_blocksize = 1,
1302 .cra_ctxsize = sizeof(struct crypto4xx_ctx),
1303 .cra_module = THIS_MODULE,
1304 },
1305 .min_keysize = AES_MIN_KEY_SIZE,
1306 .max_keysize = AES_MAX_KEY_SIZE,
1307 .ivsize = AES_IV_SIZE,
1308 .setkey = crypto4xx_setkey_aes_ofb,
1309 .encrypt = crypto4xx_encrypt_iv_stream,
1310 .decrypt = crypto4xx_decrypt_iv_stream,
1311 .init = crypto4xx_sk_init,
1312 .exit = crypto4xx_sk_exit,
1313 } },
1314
1315 /* AEAD */
1316 { .type = CRYPTO_ALG_TYPE_AEAD, .u.aead = {
1317 .setkey = crypto4xx_setkey_aes_ccm,
1318 .setauthsize = crypto4xx_setauthsize_aead,
1319 .encrypt = crypto4xx_encrypt_aes_ccm,
1320 .decrypt = crypto4xx_decrypt_aes_ccm,
1321 .init = crypto4xx_aead_init,
1322 .exit = crypto4xx_aead_exit,
1323 .ivsize = AES_BLOCK_SIZE,
1324 .maxauthsize = 16,
1325 .base = {
1326 .cra_name = "ccm(aes)",
1327 .cra_driver_name = "ccm-aes-ppc4xx",
1328 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY,
1329 .cra_flags = CRYPTO_ALG_ASYNC |
1330 CRYPTO_ALG_NEED_FALLBACK |
1331 CRYPTO_ALG_KERN_DRIVER_ONLY,
1332 .cra_blocksize = 1,
1333 .cra_ctxsize = sizeof(struct crypto4xx_ctx),
1334 .cra_module = THIS_MODULE,
1335 },
1336 } },
1337 { .type = CRYPTO_ALG_TYPE_AEAD, .u.aead = {
1338 .setkey = crypto4xx_setkey_aes_gcm,
1339 .setauthsize = crypto4xx_setauthsize_aead,
1340 .encrypt = crypto4xx_encrypt_aes_gcm,
1341 .decrypt = crypto4xx_decrypt_aes_gcm,
1342 .init = crypto4xx_aead_init,
1343 .exit = crypto4xx_aead_exit,
1344 .ivsize = GCM_AES_IV_SIZE,
1345 .maxauthsize = 16,
1346 .base = {
1347 .cra_name = "gcm(aes)",
1348 .cra_driver_name = "gcm-aes-ppc4xx",
1349 .cra_priority = CRYPTO4XX_CRYPTO_PRIORITY,
1350 .cra_flags = CRYPTO_ALG_ASYNC |
1351 CRYPTO_ALG_NEED_FALLBACK |
1352 CRYPTO_ALG_KERN_DRIVER_ONLY,
1353 .cra_blocksize = 1,
1354 .cra_ctxsize = sizeof(struct crypto4xx_ctx),
1355 .cra_module = THIS_MODULE,
1356 },
1357 } },
1358 { .type = CRYPTO_ALG_TYPE_RNG, .u.rng = {
1359 .base = {
1360 .cra_name = "stdrng",
1361 .cra_driver_name = "crypto4xx_rng",
1362 .cra_priority = 300,
1363 .cra_ctxsize = 0,
1364 .cra_module = THIS_MODULE,
1365 },
1366 .generate = crypto4xx_prng_generate,
1367 .seed = crypto4xx_prng_seed,
1368 .seedsize = 0,
1369 } },
1370 };
1371
1372 /*
1373 * Module Initialization Routine
1374 */
crypto4xx_probe(struct platform_device * ofdev)1375 static int crypto4xx_probe(struct platform_device *ofdev)
1376 {
1377 int rc;
1378 struct resource res;
1379 struct device *dev = &ofdev->dev;
1380 struct crypto4xx_core_device *core_dev;
1381 struct device_node *np;
1382 u32 pvr;
1383 bool is_revb = true;
1384
1385 rc = of_address_to_resource(ofdev->dev.of_node, 0, &res);
1386 if (rc)
1387 return -ENODEV;
1388
1389 np = of_find_compatible_node(NULL, NULL, "amcc,ppc460ex-crypto");
1390 if (np) {
1391 mtdcri(SDR0, PPC460EX_SDR0_SRST,
1392 mfdcri(SDR0, PPC460EX_SDR0_SRST) | PPC460EX_CE_RESET);
1393 mtdcri(SDR0, PPC460EX_SDR0_SRST,
1394 mfdcri(SDR0, PPC460EX_SDR0_SRST) & ~PPC460EX_CE_RESET);
1395 } else {
1396 np = of_find_compatible_node(NULL, NULL, "amcc,ppc405ex-crypto");
1397 if (np) {
1398 mtdcri(SDR0, PPC405EX_SDR0_SRST,
1399 mfdcri(SDR0, PPC405EX_SDR0_SRST) | PPC405EX_CE_RESET);
1400 mtdcri(SDR0, PPC405EX_SDR0_SRST,
1401 mfdcri(SDR0, PPC405EX_SDR0_SRST) & ~PPC405EX_CE_RESET);
1402 is_revb = false;
1403 } else {
1404 np = of_find_compatible_node(NULL, NULL, "amcc,ppc460sx-crypto");
1405 if (np) {
1406 mtdcri(SDR0, PPC460SX_SDR0_SRST,
1407 mfdcri(SDR0, PPC460SX_SDR0_SRST) | PPC460SX_CE_RESET);
1408 mtdcri(SDR0, PPC460SX_SDR0_SRST,
1409 mfdcri(SDR0, PPC460SX_SDR0_SRST) & ~PPC460SX_CE_RESET);
1410 } else {
1411 printk(KERN_ERR "Crypto Function Not supported!\n");
1412 return -EINVAL;
1413 }
1414 }
1415 }
1416
1417 of_node_put(np);
1418
1419 core_dev = kzalloc(sizeof(struct crypto4xx_core_device), GFP_KERNEL);
1420 if (!core_dev)
1421 return -ENOMEM;
1422
1423 dev_set_drvdata(dev, core_dev);
1424 core_dev->ofdev = ofdev;
1425 core_dev->dev = kzalloc(sizeof(struct crypto4xx_device), GFP_KERNEL);
1426 rc = -ENOMEM;
1427 if (!core_dev->dev)
1428 goto err_alloc_dev;
1429
1430 /*
1431 * Older version of 460EX/GT have a hardware bug.
1432 * Hence they do not support H/W based security intr coalescing
1433 */
1434 pvr = mfspr(SPRN_PVR);
1435 if (is_revb && ((pvr >> 4) == 0x130218A)) {
1436 u32 min = PVR_MIN(pvr);
1437
1438 if (min < 4) {
1439 dev_info(dev, "RevA detected - disable interrupt coalescing\n");
1440 is_revb = false;
1441 }
1442 }
1443
1444 core_dev->dev->core_dev = core_dev;
1445 core_dev->dev->is_revb = is_revb;
1446 core_dev->device = dev;
1447 mutex_init(&core_dev->rng_lock);
1448 spin_lock_init(&core_dev->lock);
1449 INIT_LIST_HEAD(&core_dev->dev->alg_list);
1450 ratelimit_default_init(&core_dev->dev->aead_ratelimit);
1451 rc = crypto4xx_build_sdr(core_dev->dev);
1452 if (rc)
1453 goto err_build_sdr;
1454 rc = crypto4xx_build_pdr(core_dev->dev);
1455 if (rc)
1456 goto err_build_sdr;
1457
1458 rc = crypto4xx_build_gdr(core_dev->dev);
1459 if (rc)
1460 goto err_build_sdr;
1461
1462 /* Init tasklet for bottom half processing */
1463 tasklet_init(&core_dev->tasklet, crypto4xx_bh_tasklet_cb,
1464 (unsigned long) dev);
1465
1466 core_dev->dev->ce_base = of_iomap(ofdev->dev.of_node, 0);
1467 if (!core_dev->dev->ce_base) {
1468 dev_err(dev, "failed to of_iomap\n");
1469 rc = -ENOMEM;
1470 goto err_iomap;
1471 }
1472
1473 /* Register for Crypto isr, Crypto Engine IRQ */
1474 core_dev->irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
1475 rc = request_irq(core_dev->irq, is_revb ?
1476 crypto4xx_ce_interrupt_handler_revb :
1477 crypto4xx_ce_interrupt_handler, 0,
1478 KBUILD_MODNAME, dev);
1479 if (rc)
1480 goto err_request_irq;
1481
1482 /* need to setup pdr, rdr, gdr and sdr before this */
1483 crypto4xx_hw_init(core_dev->dev);
1484
1485 /* Register security algorithms with Linux CryptoAPI */
1486 rc = crypto4xx_register_alg(core_dev->dev, crypto4xx_alg,
1487 ARRAY_SIZE(crypto4xx_alg));
1488 if (rc)
1489 goto err_start_dev;
1490
1491 ppc4xx_trng_probe(core_dev);
1492 return 0;
1493
1494 err_start_dev:
1495 free_irq(core_dev->irq, dev);
1496 err_request_irq:
1497 irq_dispose_mapping(core_dev->irq);
1498 iounmap(core_dev->dev->ce_base);
1499 err_iomap:
1500 tasklet_kill(&core_dev->tasklet);
1501 err_build_sdr:
1502 crypto4xx_destroy_sdr(core_dev->dev);
1503 crypto4xx_destroy_gdr(core_dev->dev);
1504 crypto4xx_destroy_pdr(core_dev->dev);
1505 kfree(core_dev->dev);
1506 err_alloc_dev:
1507 kfree(core_dev);
1508
1509 return rc;
1510 }
1511
crypto4xx_remove(struct platform_device * ofdev)1512 static int crypto4xx_remove(struct platform_device *ofdev)
1513 {
1514 struct device *dev = &ofdev->dev;
1515 struct crypto4xx_core_device *core_dev = dev_get_drvdata(dev);
1516
1517 ppc4xx_trng_remove(core_dev);
1518
1519 free_irq(core_dev->irq, dev);
1520 irq_dispose_mapping(core_dev->irq);
1521
1522 tasklet_kill(&core_dev->tasklet);
1523 /* Un-register with Linux CryptoAPI */
1524 crypto4xx_unregister_alg(core_dev->dev);
1525 mutex_destroy(&core_dev->rng_lock);
1526 /* Free all allocated memory */
1527 crypto4xx_stop_all(core_dev);
1528
1529 return 0;
1530 }
1531
1532 static const struct of_device_id crypto4xx_match[] = {
1533 { .compatible = "amcc,ppc4xx-crypto",},
1534 { },
1535 };
1536 MODULE_DEVICE_TABLE(of, crypto4xx_match);
1537
1538 static struct platform_driver crypto4xx_driver = {
1539 .driver = {
1540 .name = KBUILD_MODNAME,
1541 .of_match_table = crypto4xx_match,
1542 },
1543 .probe = crypto4xx_probe,
1544 .remove = crypto4xx_remove,
1545 };
1546
1547 module_platform_driver(crypto4xx_driver);
1548
1549 MODULE_LICENSE("GPL");
1550 MODULE_AUTHOR("James Hsiao <jhsiao@amcc.com>");
1551 MODULE_DESCRIPTION("Driver for AMCC PPC4xx crypto accelerator");
1552
